The Covid-19 Antibody Titer of Convalescence Plasma Repeated Donors at Red Cross Indonesia of Tulungagung Regency Journal title: International Journal Of Medical Science And Clinical Research Studies Authors: Ni Luh Putu Eka Sudiwati, Rachmadi Yuwana Kusuma, Ardi Panggayuh, Nia Lukita Ariani Subject(s): Medicine